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                    正则表达式
            
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                    对象的扩展
            
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                    创建对象
            
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                    原型继承
            
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                    class继承
            
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                    模块化Module
            
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                    异常处理
            
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                    编程风格
            
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                    js 扩展
            
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                    浏览器
            
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                    浏览器对象
            
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                    操作DOM
            
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                    更新DOM
            
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                    插入DOM
            
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                    删除DOM
            
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                    DOM事件
            
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                    操作表单
            
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                    操作文件
            
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                    AJAX
            
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                    Canvas
            
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                    Jquery
            
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                    选择器
            
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                    层级选择器
            
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                    操作DOM
            
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                    修改DOM结构
            
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                    事件
            
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                    动画
            
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                    AJAX
            
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                    扩展
            
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                    Nodejs
            
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                    模块
            
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                    path
            
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                    文件操作 fs
            
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                    流Stream
            
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                    zlib压缩解压缩
            
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                    net网络
            
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                    http
            
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                    express框架
            
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                    process 进程
            
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                    child_process
            
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                    os-操作系统
            
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                    React
            
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                                <h1 id="ajax">AJAX</h1>
<p>&#x7528;JavaScript&#x5199;AJAX&#x524D;&#x9762;&#x5DF2;&#x7ECF;&#x4ECB;&#x7ECD;&#x8FC7;&#x4E86;&#xFF0C;&#x4E3B;&#x8981;&#x95EE;&#x9898;&#x5C31;&#x662F;&#x4E0D;&#x540C;&#x6D4F;&#x89C8;&#x5668;&#x9700;&#x8981;&#x5199;&#x4E0D;&#x540C;&#x4EE3;&#x7801;&#xFF0C;&#x5E76;&#x4E14;&#x72B6;&#x6001;&#x548C;&#x9519;&#x8BEF;&#x5904;&#x7406;&#x5199;&#x8D77;&#x6765;&#x5F88;&#x9EBB;&#x70E6;&#x3002;</p>
<p>&#x7528;jQuery&#x7684;&#x76F8;&#x5173;&#x5BF9;&#x8C61;&#x6765;&#x5904;&#x7406;AJAX&#xFF0C;&#x4E0D;&#x4F46;&#x4E0D;&#x9700;&#x8981;&#x8003;&#x8651;&#x6D4F;&#x89C8;&#x5668;&#x95EE;&#x9898;&#xFF0C;&#x4EE3;&#x7801;&#x4E5F;&#x80FD;&#x5927;&#x5927;&#x7B80;&#x5316;&#x3002;</p>
<h3 id="ajax">ajax</h3>
<p>jQuery&#x5728;&#x5168;&#x5C40;&#x5BF9;&#x8C61;<code>jQuery</code>&#xFF08;&#x4E5F;&#x5C31;&#x662F;<code>$</code>&#xFF09;&#x7ED1;&#x5B9A;&#x4E86;<code>ajax()</code>&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x5904;&#x7406;AJAX&#x8BF7;&#x6C42;&#x3002;<code>ajax(url, settings)</code>&#x51FD;&#x6570;&#x9700;&#x8981;&#x63A5;&#x6536;&#x4E00;&#x4E2A;URL&#x548C;&#x4E00;&#x4E2A;&#x53EF;&#x9009;&#x7684;<code>settings</code>&#x5BF9;&#x8C61;&#xFF0C;&#x5E38;&#x7528;&#x7684;&#x9009;&#x9879;&#x5982;&#x4E0B;&#xFF1A;</p>
<ul>
<li>async&#xFF1A;&#x662F;&#x5426;&#x5F02;&#x6B65;&#x6267;&#x884C;AJAX&#x8BF7;&#x6C42;&#xFF0C;&#x9ED8;&#x8BA4;&#x4E3A;<code>true</code>&#xFF0C;&#x5343;&#x4E07;&#x4E0D;&#x8981;&#x6307;&#x5B9A;&#x4E3A;<code>false</code>&#xFF1B;</li>
<li>method&#xFF1A;&#x53D1;&#x9001;&#x7684;Method&#xFF0C;&#x7F3A;&#x7701;&#x4E3A;<code>&apos;GET&apos;</code>&#xFF0C;&#x53EF;&#x6307;&#x5B9A;&#x4E3A;<code>&apos;POST&apos;</code>&#x3001;<code>&apos;PUT&apos;</code>&#x7B49;&#xFF1B;</li>
<li>contentType&#xFF1A;&#x53D1;&#x9001;POST&#x8BF7;&#x6C42;&#x7684;&#x683C;&#x5F0F;&#xFF0C;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;<code>&apos;application/x-www-form-urlencoded; charset=UTF-8&apos;</code>&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;&#x4E3A;<code>text/plain</code>&#x3001;<code>application/json</code>&#xFF1B;</li>
<li>data&#xFF1A;&#x53D1;&#x9001;&#x7684;&#x6570;&#x636E;&#xFF0C;&#x53EF;&#x4EE5;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#x3001;&#x6570;&#x7EC4;&#x6216;object&#x3002;&#x5982;&#x679C;&#x662F;GET&#x8BF7;&#x6C42;&#xFF0C;data&#x5C06;&#x88AB;&#x8F6C;&#x6362;&#x6210;query&#x9644;&#x52A0;&#x5230;URL&#x4E0A;&#xFF0C;&#x5982;&#x679C;&#x662F;POST&#x8BF7;&#x6C42;&#xFF0C;&#x6839;&#x636E;contentType&#x628A;data&#x5E8F;&#x5217;&#x5316;&#x6210;&#x5408;&#x9002;&#x7684;&#x683C;&#x5F0F;&#xFF1B;</li>
<li>headers&#xFF1A;&#x53D1;&#x9001;&#x7684;&#x989D;&#x5916;&#x7684;HTTP&#x5934;&#xFF0C;&#x5FC5;&#x987B;&#x662F;&#x4E00;&#x4E2A;object&#xFF1B;</li>
<li>dataType&#xFF1A;&#x63A5;&#x6536;&#x7684;&#x6570;&#x636E;&#x683C;&#x5F0F;&#xFF0C;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;&#x4E3A;<code>&apos;html&apos;</code>&#x3001;<code>&apos;xml&apos;</code>&#x3001;<code>&apos;json&apos;</code>&#x3001;<code>&apos;text&apos;</code>&#x7B49;&#xFF0C;&#x7F3A;&#x7701;&#x60C5;&#x51B5;&#x4E0B;&#x6839;&#x636E;&#x54CD;&#x5E94;&#x7684;<code>Content-Type</code>&#x731C;&#x6D4B;&#x3002;</li>
</ul>
<p>&#x5176;&#x4ED6;&#x9009;&#x9879;&#x8BE6;&#x60C5;<a href="https://www.w3school.com.cn/jquery/ajax_ajax.asp" target="_blank">w3c</a>.</p>
<p>&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x53D1;&#x9001;&#x4E00;&#x4E2A;GET&#x8BF7;&#x6C42;&#xFF0C;&#x5E76;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;JSON&#x683C;&#x5F0F;&#x7684;&#x6570;&#x636E;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> jqxhr = $.ajax(<span class="hljs-string">&apos;/api/categories&apos;</span>, {
    dataType: <span class="hljs-string">&apos;json&apos;</span>
});
<span class="hljs-comment">// &#x8BF7;&#x6C42;&#x5DF2;&#x7ECF;&#x53D1;&#x9001;&#x4E86;</span>
</code></pre>
<p>&#x4E0D;&#x8FC7;&#xFF0C;&#x5982;&#x4F55;&#x7528;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x5904;&#x7406;&#x8FD4;&#x56DE;&#x7684;&#x6570;&#x636E;&#x548C;&#x51FA;&#x9519;&#x65F6;&#x7684;&#x54CD;&#x5E94;&#x5462;&#xFF1F;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> jqxhr = $.ajax(<span class="hljs-string">&apos;/api/categories&apos;</span>, {
    dataType: <span class="hljs-string">&apos;json&apos;</span>
}).success(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">data</span>) </span>{
    ajaxLog(<span class="hljs-string">&apos;&#x6210;&#x529F;, &#x6536;&#x5230;&#x7684;&#x6570;&#x636E;: &apos;</span> + <span class="hljs-built_in">JSON</span>.stringify(data));
}).error(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">xhr, status</span>) </span>{
    ajaxLog(<span class="hljs-string">&apos;&#x5931;&#x8D25;: &apos;</span> + xhr.status + <span class="hljs-string">&apos;, &#x539F;&#x56E0;: &apos;</span> + status);
}).complete(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    ajaxLog(<span class="hljs-string">&apos;&#x8BF7;&#x6C42;&#x5B8C;&#x6210;: &#x65E0;&#x8BBA;&#x6210;&#x529F;&#x6216;&#x5931;&#x8D25;&#x90FD;&#x4F1A;&#x8C03;&#x7528;&apos;</span>);
});
</code></pre>
<p>&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x8BE6;&#x60C5;<a href="https://www.w3school.com.cn/jquery/ajax_ajax.asp" target="_blank">w3c</a>&#x3002;</p>
<h3 id="&#x5B89;&#x5168;&#x9650;&#x5236;">&#x5B89;&#x5168;&#x9650;&#x5236;</h3>
<p>jQuery&#x7684;AJAX&#x5B8C;&#x5168;&#x5C01;&#x88C5;&#x7684;&#x662F;JavaScript&#x7684;AJAX&#x64CD;&#x4F5C;&#xFF0C;&#x6240;&#x4EE5;&#x5B83;&#x7684;&#x5B89;&#x5168;&#x9650;&#x5236;&#x548C;&#x524D;&#x9762;&#x8BB2;&#x7684;&#x7528;JavaScript&#x5199;AJAX&#x5B8C;&#x5168;&#x4E00;&#x6837;&#x3002;</p>
<p>&#x5982;&#x679C;&#x9700;&#x8981;&#x4F7F;&#x7528;JSONP&#xFF0C;&#x53EF;&#x4EE5;&#x5728;<code>ajax()</code>&#x4E2D;&#x8BBE;&#x7F6E;<code>jsonp: &apos;callback&apos;</code>&#xFF0C;&#x8BA9;jQuery&#x5B9E;&#x73B0;JSONP&#x8DE8;&#x57DF;&#x52A0;&#x8F7D;&#x6570;&#x636E;&#x3002;</p>
<p>&#x5173;&#x4E8E;&#x8DE8;&#x57DF;&#x7684;&#x8BBE;&#x7F6E;&#x8BF7;&#x53C2;&#x8003;<a href="https://www.liaoxuefeng.com/wiki/1022910821149312/1023022129105888" target="_blank">&#x6D4F;&#x89C8;&#x5668;</a> - <a href="&#x6D4F;&#x89C8;&#x5668;/AJAX.md">AJAX</a>&#x4E00;&#x8282;&#x4E2D;CORS&#x7684;&#x8BBE;&#x7F6E;&#x3002;</p>

                                
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